Here, here, and here talks about the process, which I will outline here.
It's so super easy. Seriously.
- Take a handful of moss, maybe even a little less than what you can hold in your hand.
- Put it in a blender with a little water, some yogurt or milk or sour cream or beer or buttermilk, and blend.
- Spread the mixture over the are on which you want moss to grow.